Two small spheres spaced 20.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10−214.57×10−21 newtons

A small glass bead charged to 4.5 nC is in the plane that bisects a thin, uniformly charged, 10-cm-long glass rod and is 4.0 cm from the rod's center. The bead is repelled from the rod with a force of 740 μN. What is the total charge of the rod?

In the figure four particles form a square with edge length a = 2.98 × 10-2 m. The charges are 91 = 94 = 1.84 × 10-15 C and 92 = 93 = 9. (a) What is q if the net electrostatic force on particle 1 is zero? (b) Is there any value of q that makes the net electrostatic force on each of the four particles zero? a) Number b) i a 3 Units a N•m^2/C > 12 4

An electron is shot directly toward the center of a large metal plate that has surface charge density -2.0* 10-6 C/m2. If the initial kinetic energy of the electron is 1.60 *10-17 J and if the electron is to stop (due to electrostatic repulsion from the plate) just as it reaches the plate, how far from the plate must the launch point be?

Point charges of 20.2 µC and 44.7 µC are placed 0.48 m apart. At what point along the line between them is the electric field zero?   What is the magnitude and direction of electric field halfway between them?   There is no direction because the magnitude of the electric field is zero toward the 20.2 µC charge toward the 44.7 µC charge

A thin charged rod has a linear charge density of λ = 8.00 nC/m. How much charge is on a piece of the rod 1.40 cm long? 0.112 nC 11.2 nC 0.175 nC 572 nC

Two red blood cells each have a mass of 9.05 x 10-¹4 kg and carry a negative charge spread uniformly over their surfaces. The repulsion arising from the excess charge prevents the cells from clumping together. One cell carries -3.00 pC and the other -2.90 pC, and each cell can be modeled as a sphere 3.75 x 10-6 m in radius. If the red blood cells start very far apart and move directly toward each other with the same speed, what initial speed would each need so that they get close enough to just barely touch? Assume that there is no viscous drag from any of the surrounding liquid. initial speed: What is the maximum acceleration of the cells as they move toward each other and just barely touch? maximum acceleration: m/s m/s²

The adjacent figure shows charged spherical shells A, B and C having charge densities o,-o,o and radii a, b, c, respectively. If VV then b equals to (а) а+с (b) Va +c (c) Vac (d) none of these

Two red blood cells each have a mass of 9.05 x 10-14 kg and carry a negative charge spread uniformly over their surfaces. The repulsion arising from the excess charge prevents the cells from clumping together. One cell carries –3.00 pC and the other -3.50 pC, and each cell can be modeled as a sphere 3.75 × 10-0 m in radius. If the red blood cells start very far apart and move directly toward each other with the same speed, what initial speed would each need so that they get close enough to just barely touch? Assume that there is no viscous drag from any of the surrounding liquid. initial speed: m/s What is the maximum acceleration of the cells as they move toward each other and just barely touch? maximum acceleration: m/s?

A uniform line of charge of length L/4 lying betweenx = 0 and x= L4 is charged with Q os shown in the figure. Which of the following gives the electric field at point P located at x = 3L/4? P 3L/4 3kQ 4L dx 3L 3kQ L/4 dx o 4L L/4 4kQ dx 4kQ 31/4 dx O L Jo 4kQ L/4 dx L 'o 3L